Nucleobase

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Nucleobase Nucleoside
Missing image
Adenine_chemical_structure.png
Chemical structure of adenine


Adenine
Missing image
A_chemical_structure.png
Chemical structure of adenosine


Adenosine
A
Missing image
Guanine_chemical_structure.png
Chemical structure of guanine


Guanine
Missing image
G_chemical_structure.png
Chemical structure of guanosine


Guanosine
G
Missing image
Thymine_chemical_structure.png
Chemical structure of thymine


Thymine
Missing image
T_chemical_structure.png
Chemical structure of thymidine


Thymidine
T
Missing image
Uracil_chemical_structure.png
Chemical structure of uracil


Uracil
Missing image
U_chemical_structure.png
Chemical structure of uridine


Uridine
U
Missing image
Cytosine_chemical_structure.png
Chemical structure of cytosine


Cytosine
Missing image
C_chemical_structure.png
Chemical structure of cytidine


Cytidine
C

Nucleobases are the parts of RNA and DNA that are involved in pairing up (see also base pairs). These include cytosine, guanine, adenine, thymine (DNA) and uracil (RNA). These are abbreviated as C, G, A, T, and U, respectively.


Uracil replaces thymine in RNA. These two bases are identical except that uracil lacks the 5' methyl group. Adenine and guanine belong to the double-ringed class of molecules called purines (abbreviated as R). Cytosine, thymine, and uracil are all pyrimidines (abbreviated as Y).

A nucleobase covalently bound to the 1' carbon of a ribose or deoxyribose is called a nucleoside, and a nucleoside with one or more phosphate groups attached at the 5' carbon is called a nucleotide.

See also

Template:Nucleic acidseo:Nitrogena bazo es:base nitrogenada

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